[Dovecot] pop3 retr error

[Marten Lehmann]

Hello,

I'm getting the following error while Mozilla Mail is downloading >4000 
emails:

The RETR command did not succeed. Error retrieving message. Mail server 
xxx responded: Message is deleted.

So what's the error? Can't I retrieve a message, that has been marked as 
deleted before? If the Mesage-ID wouldn't exist, the error message would 
be different. I don't know what Mozilla Mail is doing and on which 
message id it is failing. Also, there's no output in the logfiles. Any 
ideas?

Regards
Marten